Not very, it’s as time consuming as you make it!
Here’s a rough idea of my process:
- Paint the base model a flat brown
- Stipple on a mix of Turquoise and Mid Green (eyeball the colour)
- Stipple on the above but desaturated with a light Grey (45° angle from top)
- Wash any exposed brown areas with a black wash
- Use another clean brush to streak some black wash down over painted areas
- Mix up more of that Tur+Green+L Grey Mix with more grey and stipple that on top and exposed areas
- Use nihilakh oxide to streak or sit in select grooves (lighten with a pale grey or white if it’s not light enough)
I wouldn’t use any actual metallic bronze or brass paint unless the object is at a height where it can be touched or rubbed against to expose the untarnished metal.
Always check against actual statues etc to see how water streaks on them.
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This one above shows why the black wash is a useful step. Also the 45° from top weathering.
Note the dark streaks over the verdigris on its right hand.
There are other ways (probably as many as there are painters!)
A quick way would be to spray brown, then slap on a load of dirty down verdigris paint. Doesn’t always look right though.
